SUM The Sinclair/Timex Users Magazine

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Volume Ill

One of the complaints most often heard
about the Timex 2068 and its keyboard is
the "dead" keys and/or spacebar that _ so
often develops. Here is a procedure that
will often solve the problem.

An understanding of how the 2068 key-
board is made reveals the solution. The
accompanying photo shows the constituent
parts. When viewing the 2068 only the
overlay and the keys are visible. In fact,
under the overlay is a hard plastic sheet
with all the keys mounted through it.
Under this sheet is a rubber membrane with

JULY 1985

TS 1000 _ . TS 1500 TS 2068

i? SINCLAIR/TIMEX USERS MAGAZINE

$950

Number 7

é

Reviving the 2068 Keyboard ©

a convex "bubble" forined precisely under
each key in the layer above it. Mounted to
the underside of each bubble or dome is a
small conductive button. The bottom layer
of the keyboard consists of the printed
circuit board laid out as a matrix. Con-
sulting a circuit diagram of the 2068
shows that the computer reads the keyboard
by checking each vertical and horizontal
line on the circuit board for a completed
circuit. A closed circuit is made as _ the
key presses the dome which presses the

...continued on page 8

Gainesville TUG Meetings

The Gainesville Timex Users Group has changed
its meeting time and place. Meetings are now the third
Tuesday of each month in the northeast classroom
area of the Crossroads Church building located at
2720 SW Second Avenue in Gainesville. Meeting time
is still 7:00 p.m. These facilities are somewhat larger
than what we have used in the past and can accom-
modate a number of computer set-ups.

Anyone needing more information about the next
meeting can call Joe Williamson at 904/462-1086 or
Richard Cravy at 904/378-9000.

TS 1500 TS 2068

THE SINCLAIR/TIMEX USERS MAGAZINE
3224 Northwest 30th Avenue
Gainesville, Florida 32605
904/378-9000 or 462-1086 evenings

FS Pe Sn Joe Williamson
Richard Cravy
Bill Woodward & John Monkus

S

TS 1000

SUBSCRIPTION RATES 9/1/85

Regular Subscription (U.S.) $15.00/year
Canadian Subscription $18.00/year
All other countries please inquire first
Published monthly

ADVERTISING RATES 9/1/85

gpg, Bese oa eee eS ee ee $75
PO os oe es 0 $45
ST. 8, | See eee eee ee $25
ee eR ae ae ae er a ere $15

These prices do not include artwork or ad layout. There
will be an extra charge for custom ad work. Ads should
be in our offices by the 10th of month of publication.

Classifieds: $2.00 per line. FREE personal ads for
subscribers (no dealers).

SUBMISSIONS

We are willing to pay for articles published (after
editing). Our current rate is 10¢ per text line and 10¢ per
program line (after editing). Authors should indicate if
they wish to be paid when submitting material.

CORRESPONDENCE

Please provide us with all information on your mailing
label in all correspondence. Your subscription expir-
ation is printed on your label with four digits; the first
two indicate the year, the last two the month. Please tell
Our advertisers you saw their ad in SUM.

BACK ISSUES OF SUM
AVAILABLE

The following back issues of SUM Magazine are
available for purchase while the supply lasts. Back
issues before this are no longer available except on a
more expensive “photocopied” basis. To order, use
or make a copy of the order form inside the back
cover of this issue, check the appropriate square(s)
and mail with a check to the address listed there. By
popular request we have listed a partial “Table of
Contents” for each issue.

- January, 1985 — TS-2068 Printer Interface Hardware

Project; Beginner's Programming, Part |; Sears RGB
Monitor with TS-2068; More on Spectrum software
running on modified TS-2068. 10 pages.

February, 1985 — February Vendor Report; TS-2068
Printer Interface, Part Il; Beginner's Programming,
Part Il; Tasword II Improvements. 12 pages.

March, 1985 — Spectrum Plus Now in U.S.; TS-2068
Printer Interface, Part Ill; A & J Microdrive Review;
SPECTAX85 Review; Beginner’s Programming, Part
Ill. 16 pages.

April, 1985 — Timex Portugal Coming; ZX Microdrive
Interface for 2068 Announced by EMC; Tasword Il on
the A & J Microdrive; User-Defined Graphics for the
TS-1000, Part |; Beginner’s Programming, Part IV;
Rocket Man Review; Using Aerco Interface with
Spectrum Rom. 16 pages.

May, 1985 Special Issue — Publisher’s Statement;
Portuguese 2068 Computer and Disk Drive System
Hands-On Evaluation; Rotronics Wafadrive Review;
Convert Your TV into a Monitor; Pro/File 2068
Review; Zaxxon Review; User-Defined Graphics for
the TS-1000, Concluded. 28 pages.

June, 1985 — The Consumer Electronics Show; 2068
Graphics Primer; Spectrum Plus Review; Keyboard
Template for Tasword II Users. 20 pages.

ry
.

ASTRONOMY PROGRAMS
astronamers,

(25-2066) for
Mavigators, science
classes,etc. Ceampute positions of
Sur, Moon, & planets for any date;
Find dates & times of moon phases,
solar & lunar eclipses; sumrise/
Sunset times; eguinoxes/solstices
(seasons); Julian Day &€ .sidereal
time, Com
plete set $14.95

& 1M year calendar.
(Cape & maruwal):

I. Auersbacher
41 King Street Az

Belleville, NJ @7149
REESS EGER REA EKER ERHERRER eee Bee

The Computer Shopper Magazine

One of my favorite magazines, next to
SUM Magazine, is the COMPUTER SHOPPER from
Titusville, Florida. With an annual sub-
scription rate of $15.00 and a monthly
size of over 200 pages tabloid size, it
has to be a great value. The SHOPPER is
stuffed full of discount mail-order ads
and 20 or so pages of classifieds. It is
one publication that I read practically
from cover to cover the articles by Stan
Veit, Don Lancaster, Les Solomon and a
host of lesser known writers who have
fresh and interesting reviews and how-to
articles for the general user as well as
"survival columns" for the Timex, T1I-99/4,
Sanyo, Tandy, Atari, and CP/M computers.

With the whole computer market seeming
to be going to IBM and Commodore, it is
great to find a publisher who recognizes
the continuing needs of these other
owners. The Timex column is written by
Mark Fendrick, who I do not know, but who
has attempted to inform CS readers of the

great potential for their machines with
articles on Spectrum ROMs, microdrives,
new software, and the Portuguese disk

drive system.

But even without the Timex
would studiously read each issue because
of the great bargains available in its
pages which, alas, my bank account’ seldom
can take advantage of...but that doesn't
stop me from wishing! Let me give you a
few examples from the most recent issue
(August 1985):

Thinking of moving up to a "big" com-
puter but want a bargain price? Solvex
Marketing is selling brand new Sanyo MBC
3000 computers with built-in monitor,
detached keyboard, two disk drives, Word-
star, Calcstar, etc., and CP/M 2.2--all
for an incredible $599 on page 32.

CP/M not big enough? Then perhaps’ the
NCR PC1 with IBM compatibility, 256K, two
disk drives, and MS-DOS 2.11 for $1295
from Computrade (page 88) is what you are
looking for.

Anyone want a leading brand RGB monitor
for $269? Thrifty Bits (page 94) has the
14" Leading Edge RGB monitor with 16 color
output and 80 column by 25 line text dis-
play ability.

Maybe you need a printer. How about an

column, I

Okimate 20 with parallel interface for
$199 (p. 134); a Comrex CR-IIE 20 cps
daisy wheel printer for $266 (p. 135); a
3M Whisperwriter 200 thermal printer for
$79.95 (p. 159)3 or even a Corona Laser
Printer for $2699 (p. 16).

Still more "good deals"? An NEC 8201
portable computer (Radio Shack 100 look-a-
like) for $348 (p. 160) sounds good. How
about an Epson OX 10 for $999 (p. 182).
Have a thermal 80 column printer or type-
writer? Here's 8 1/2 x 11 thermal paper
for $2.99 per package of 500 (p. 127).

I think this is enough to give you some
idea of what all I can't afford to buy but
wish I could from Computer Shopper adver-
tisers. I highly recommend everyone who
loves computers to subscribe, or at least
pick up a copy from your local magazine
rack. I have found copies at B. Dalton's,
Walden's, and Albertsons. Computer Shop-
per, P. O. Box F, Titusville, FL 32781.
Subscriptions are $15/year. |

-- Richard Cravy

Tell them you saw it in SUM

a

ut
pout © e!
eo inven
T

A&S dRive?
MODEL 2000 STRINGY FLOPPY

MADE IN U.S.A.

FEATURES
e Lowest cost high speed mass storage
system available.
e High speed 11K baud data transfer rate.
e Loads 28K program in 24 seconds.
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e No rewinding or volume controls.
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e Multiple drive systems.

PART #

PRODUCT NEW PRICES

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includes: Interface, Drive, Expansion Cardedge
Owner's Manual, 5 Micro Wafer Ils, Wafer Organizer

7 $ 149.50
Add $6.50 Shipping

830017 MODEL 2000 OWNER’S MANUAL 4.95
820040 MODEL 2000 DRIVE 2 99.50
900001 5’ MICRO WAFER II 3.50
900002 += 10’ MICRO WAFER II 3.50
900003 20’ MICRO WAFER II 4.00
900004 35’ MICRO WAFER Il 4.00
900005 50’ MICRO WAFER II 4.50
850001 WAFER ORGANIZER (Folder holds 16 wafers) 5.00
850002 WAFER CADDY (Desk Top Tray holds 6 wafers) 9.95
850003 WAFER WHEEL (Desk Top Wheel holds 30 wafers) 18.75
RE a
STANDARD WARRANTY: QTY ITEM UNIT PRICE PRICE

All A&J Micro Drive Sales & Service products (except MICRO
WAFERS) are warranted for 90 days. If your products should
fail within 90 days, A&J Micro Drive will repair your products for

:

no charge, if return postage paid. Additionally, all products
may be returned postage paid within 30 days for full refund of
purchase price. 30 day refund policy may vary with A&J Micro
Drive Hardware suppliers.

WAFER WARRANTY:
Wafers are guaranteed for a period of 45 days from date of
shipment. If the wafer should fail during this period, return the
wafer post paid and replacements will be returned as soon as
possible at no charge.

A&S tev?

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1050 “I” EAST DUANE AVENUE, SUNNYVALE, CA 94086

4

O Send $4.95 for Owners Manual and more information.

O Check or Money Order Enclosed

O C.O.D. add $1.65

O U.P.S. shipping cost, add $3.00, unless other specified
O CA residents add 6.5% sales tax

O Charge tomyO VISA O MASTERCARD

Card # Exp. date

Name
Address
City

State Zip

(408) 732-9292

Hi-Res Graphics for the TS-1000
A Review of I.S.I.’s Software

“High Resolution Graphics MK. II" is a
software high resolution graphics program
for the TS-1000 line of computers. It has
the ability to plot points, unplot points,
write in upper and lower case, test a
point on the screen, invert the hi-res
screen, and copy the hi-res screen to the
printer. The resolution comes as 192 X 128
but can be expanded up to 192 xX 256 in
some applications.

The program auto-runs after loading and
gives you an example of hi-res with both
upper and lower case text telling where
the addresses are for each operation. You
use RAND USR XXX in your program each time
you wish to access ae function. Each
function is easy to use and examples are
given.

Included in the documentation is a
short program which will allow you to draw
on the screen using the arrow keys (see
example), and a test program for writing
in upper and lower case.

As an example, to use upper and lower

case, you must first clear the hi-res
screen using RAND USR_ 16572, call the
hi-res routine with RAND USR 16514, place

in a PRINT statement what you wish to
print in upper and lower case (using
inverse characters for upper case), POKE
16417 with the line you wish it to appear
in, and call the print routine with RAND
USR 17285.

The characters are not the best in the
world; I like the upper and lower’ case
letters on the 2068 much better. If I knew
where the character table started, it
would be easy to change to a more pleasing
character set.

:se em: soe : :{s Fr mes elt see ee ee ee et eee eee meee eee eee
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Another thing that isn't explained in
the manual is that you must be in SLOW

mode in order to see what is being
printed. The plot routines are much
quicker than the Sinclair plot.

The code is short and only takes about

a minute to load. I am very happy with
this program. It does a lot and is easy to
use. Best of all it is inexpensive. They
also list a word processor using the
hi-res routines which should be pretty
good from what I've seen here. They state
in several places that it only works with
the TS-1000 and ZX81, but it loaded and
ran fine on my TS-1500 as well.
Available from: Inter-Pacific
Inc. 3770 Duke Rd, RR #1,
Canada V8X 3W9. $7.49 (US).
-- Joe Williamson

Systems
Victoria, BC,

f

SKIPPER ELECTRONICS

We have the parts you need for all your
hardware construction projects.

SKIPPER ELECTRONICS
3708 Newberry Road — Gainesville, FL 32607
904/373-6796

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second

special
changing
switches
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copying the
bytes
the

changing the

it didn't seem to be

+*s
character
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USR set by changing the values of S and T

which are

and
into the

characters while line 6010 puts

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t one

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jus
start out by

the beginning of the
back

Creating Your Own TS-2068 Character Set

After you type in the program and _ RUN
can
Sets can also be saved as

I really enjoy making
it you

One of the features that made me get my
with this program which

2068 was the possibility of

worth the trouble until I saw the
alphabet used in a program that was
character set and UDG set respectively.
Sinclair character set and then

we

use in other programs. Line 6000

character set.
in better legibility,

too.
INake more than

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you wish
and press

The character editor routine is entered
character

by pressing a
1 to plot, press 0 to unplot, press

arrow keys to move the dots around.
return to the menu,

change. While in the edit mode,

POKE the new character.

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with just the old alphabet again.

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3918 IF S$ik ,b + -—“9R* THEN FRIANT &F

i Stikh-eidt £2 ,2H+4+41L4+i+ 42; DYER 7;*°

3928 IF S$ik +i .£3-*8F* THEN PRINT
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See =s ;

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#88 FE = HRS

#48 LET A-#: LET 6-8: LET tC#-fH

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FHRER Fits: INVERSE i;ct: Gi S$

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4228 IF INKEYE-"N** THEN BEEP 8.8
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S: FAPER 6:°° “*“: 606 Toi 2288

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4628 IF CHR+id3 THEN LET xK-T+8s:
PHGpE Ce-idd:: £6 Tl 4946

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M LET ProP+HtJj?

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—#: NEXT FT: RETURN

L828 Fis Bee = Spee

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S458 NEXT J: NEXT I: RETURN
3388 CO SUG 3688: PRINT THE @; F
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$5938 RETURN

S688 LEY 23-53-2565: PORE 223666 ,.i-2
SG*#INT t3/256:: POKE 23667 ,INT ¢
3/256;:: RETURN

$6286 PORE 22675 ,T-256INT if 7256
*#!: PORE 22676,INT its256;

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6486 PORE 226865 ,4@: PORE 23687 ,6£8
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7888 FRié CHES |
7418 INK i: PAPER S: EBEORLRER &S: €

LS
7428 PRINT AT 9,1;“TITLE OF BYTE
5 : ENTERS ““oHRg****

‘ MATH & SCIENCE SOFTWARE
F for your TS1000, 1500, & TS 2068

Be MATHEMATICS ............ $14.95 pp.

Linear regression, simultaneous equations, any
base conversion, determinants, compute primes,
GCD, LCM, roots of functions, solve triangles,
and some vector operations.

e THE CALCULUS ........... $14.95 pp

Numerical integration, differentiation, 1,2,3rd
derivatives of functions, & Gaussian quadrature,
ist,2nd order differential equations by Runge-
Kutta and Adams-Moulton methods.

® WEATHERCASTER ....... $14.95 pp

Predict the local, short term weather (1800 pos-

sible predictions, with wind speed & direction)
Also computes relative humidity, dew point, THI
temperature-humidity, index, and wind chill.

e ASTROLOGY ......... wesc. 914.95 Pp

Compute astrology natal horoscope charts. Output
includes Sun sign, ascendant, midheaven, planet—
ary locations by sign, house & degree, Placidus
house cusps, and the major “planetary” aspects.

)

@ Prices include high quality cassette tape,
booklet of instructions & sample problems,
and shipping by first-class mail.

@ SPECIFY COMPUTER MODEL WHEN ORDERING, PLEASE.

|. AUERSBACHER, MS.
all 41 King Street, A2
Belleville, NJ 07109

ul

: 9
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PHAR CLODE

REVIVING THE 2068 KEYBOARD
continued from page 1
button across the two lines unique to that
character on the keyboard.
The major problem with this arrangement
is the build up of a resistive corrosion
on the contacts of the circuit board. Les-

sening or remedying the problem is pos-
sible without opening your computer. Here
are the steps:

(1) Carefully lift one corner of the key-

board overlay and gently lift off the com-
plete overlay and lay it aside. You will
find it stuck down with something akin to
contact cement and will 1ift up without
bending if you are careful.

(2) Unscrew the hard plastic sheet holding
the keys in place. Turn the computer
while holding this sheet in place

over
with

your hand. The sheet will come out in your
hand with all keys in place. Lay the sheet
aside face down so the keys will not get
out of place.

(3) Lift off the rubber sneet to reveal
the circuit board beneath.
(4) Obtain some color TV tuner contact

cleaner from Radio Shack along with some
cotton tipped plastic swabs (O-tips).
Scrub each circular contact point on the
circuit board giving special attention to
the keys which were giving trouble and
the space bar contacts.
(5) Reassemble your keyboard. Use contact
cement to help re-stick your overlay.

Now try it out. I found that all my
"dead" keys but one, and my space bar, had
their old life back. Only the "i" key

still has a little difficulty contacting.
-- Richard Cravy

FOOTE <%, SOFTWARE

eA h2, | 2.*. | Ree ee

The SPECTRUM ROM allows your TS2068 to run 99%
of all Spectrum 48k software. Just swap out your pres-
ent ROM or build the “Spectremulator’ described in the
August & September issues of SUM Magazine.

Spectrum ROM Software

Pitter PUGE 5 8 oS. eS SS $14.95
Faster than Flight Simulator/includes air combat!

Sg ks eee ee eS ee eee :

Matic Minet sc... se $13.95
Fast action arcade maze games! Works on both
Spectrum and 2068 (we tell you how’).

TS2068 ROM Software
Badgammon ae ee ee $15.00
U.S.A. (Presidents/States & Capitols)........... $12.95
Pmore Coumel... .. 3 rb SS $12.95

Advanced Math (Calculus)

ZX81/TS1000/TS1500 Software

‘$s 9 see eS ee ee $7.95
Calorie Counter ... .. ...%%. 4 eux Lose &7.95
Beeanete WM ee 36 5 28S eS $7.95
Tic-Tac-Toe/Hangman ................... $7.95

Add $1.00 on all orders for shipping/handling

FOOTE SOFTWARE
P. O. Box 14655 — Gainesville, FL 32604-4655
904/462-1086 6-9 p.m. EST

Zebra Talker — A Review

The Zebra Talker is a hardware and
software combination that will allow you
to synthesize human speech. The system is
based around the Votrax SC-01 Speech
Synthesizer IC which produces 45 basic
speech sounds and links them together to
make speech. Approximately 1400 words are
able to be created using this device. A
phoneme editor and text-to-speech software
come with the package.

The hardware portion of the Zebra
Talker is basically an I/O port (191)
connected to the Votrax speech syn-

thesizer. The interface has it's own power
supply so as to not use any of the
computer's power. A sound output cable
leads away to be connected up to your
monitor audio input or some other ampli-
fier (the output is low level and requires
some type of amplification). A resistor-
Capacitor combination acts as an clock
oscillator for the synthsizer IC. There is

TS Heritans

Affordable Quality for the Timex Computer User

Each issue brings you 40 pages of usable information, program
listings, product reviews, programming articles, hardware projects,
and applications for your computer. T-S HORIZONS features nation
ally known authors like Paul Hunter, Gordon Young, and others.
The price is ONLY $15.00 for a full year (12 issues)

AND for a limited time only, new subscribers will receive our
special telecommunications issue (#7, see below) “FREE* with
their subscription.

TS Harivens

Y aun a an anon a
ahead
oni iwbepoedndodad dal

TS- 1006/1508
BANK SWITCHING 8

1$-2068
—

atv; th
Rumors & hic New Coloma

* Byte Back Modem Review
* 2068 Programming Tips
* How a Compiler Works * Telecommunications for Beginner
*“ Book & Game Reviews * Rotating Globe Routine
Articles By Gordon Young and Paul Hunter * Sinclair Info. Net.
* TS-1000 Power Supply - and more!!!

IN T-S HORIZONS #7

IN T-S HORIZONS #7

Enclose $15 (US) for 12- — NAME

subscription, plus “FREE*
issue (while supplies last). $21

|

| Canada, $25 other foreign. Extra ADDRESS

| back issue/sample:$2.00.

CITY

i SEND TO:

T-S HORIZONS ian a

I
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2002 Summit Street
2 Portsmouth, Ohio 45662 SUM 4 sAtTisFACTION GUARANTEED «

11

and creates the proper sequence of

no on-off switch, power being supetee by
plugging in the cable.

The Z Talker comes with the Votrax
speech dictionary, so even if you had no
software, you could create speech by just
OUTing the proper values to port 191 and

then use PRINT IN 191. To make this
easier, a phoneme editor program is
supplied to let you easily "build" your

Own speech.

The editor lets you build up your words
one sound at a time using the Votrax
dictionary or your own guessing. After you
have built up a word(s), you can print out

the sequence of sounds along with the
Votrax symbol, the hex and decimal equi-
valent, and the 2068 character. For exam-

ple, if you want it to say "computer", you
would enter the following sequence of
sounds as given in the Votrax dictionary:

K Uhl & Dp ¥1.-20. Bt. ft ex

Notice the different "vowel" sounds.
There are 36 in all. A table containing
special vowel-phoneme combinations is also
given in the dictionary. This is not new;
if you open any good sized dictionary,
they will usually have phonetic repre-
sentations at the bottom of the page. This
idea is used here to create speech from a
set of common sounds!

The second program contains a text to
speech routine that allows you to just
type in words and the computer will speak
them! This is the best part of the
package! Using stream #4, all text is sent
to the synthesizer. The machine code can
be easily added to your own, program at
location 59000 and is 6000 bytes long.

The use is very easy and almost
pletely transparent to the user. All you
have to do is enter your text into your
programs with PRINT #4 statements. For it
to say “computer talks", all you would
have to do is enter into your program:

com=

10 PRINT #4;"computer talks"

The text to speech program will handle
about 90% of all words’ entered. The
program checks for combinations of letters
sounds

to produce the spoken word. Due to certain
unusual combinations and so many rules in
the English language, some words come out
pronounced wrong. In the last example, the
word "computer" comes out sounding like
“compooter". To correct the pronunciation,
you need to "fudge" the spelling. To make
“computer™ sound right you need to enter
“compu ter".

The sound from the Z Talker is very in-
telligible and can be changed in pitch by
a simple POKE. There are some sounds it
has trouble with though. It has trouble
with the "p"™ sound. It sounds more like a
quiet "t" in most instances. But ' some
sounds are perfect like when you have it
say "six".

If you really want to change the pitch
drastically, you can change capacitor C2
to a higher or lower value and make it
range from sounding like Jaba the Hut to
Kermit the frog!

I would like to see a nice case for the
interface instead of the two pieces of
cardboard stuck on each side. Also, I
would like to see the power drawn from the
computer instead of a separate supply and
I wish that they provided a longer audio
cable so it would reach the back of my
monitor. One last thing, it should have a
2068 wide feedthrough connector so as to
add other 2068 interfaces.

Over all, I'm impressed. The construc-
tion of the interface, the quality of the
programs, even the sound is pretty good.
Using the text-to-speech, it's fun to see
how well it pronouces all the words you
tell it to and to see what happens’ when
you make words up. And remember, it will
sound the same no matter what computer
it's on.

Available from: Zebra Systems, [Inc.,
78-06 Jamaica Avenue, Woodhaven, NY 11421
(718) 296-2385 |

-- Joe Williamson

Help Our Advertisers
Out... Tell Them You

Saw Their Ad in
SUM MAGAZINE!

12

TU

i

bab nane
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|
°
|

The monthly magazine with a natural blending of two
popular hobbies — Ham Radio and Computers
x Articles on Ham Radio & Most Personal Computers
* Hardware & Software Reviews
* Various Computer Languages
* Construction Articles
* Much Much More

“received my moneys worth with just one
issue...”

—J. Trenbick

“always stop to read CTM, even though
most other magazines | receive (and write for)
only get cursory examination...”

—Fred Blechman, K6UGT

SOG See ee $15.00 for 13 issues
Mexico, Canada

(U.S. funds only)
Permanent (U.S. Subscription)
SF Tit) o} (=m Ore) 0)

Circulation Manager
1704 Sam Drive
Birmingham. Alabama 35235
Phone 205/854-0271

Name ; Sen ee
Call Sign

Address |

City State

Zip Phone

Date

—

Signature

i esssiassssssteesstsnsssnensssessunststestsasnesssnensns>

An Update on Using the Portuguese Disk Drive

As I write

this, I have had the Portu-
guese disk drive system for about 6 weeks.
My experience with the system continues to
be very positive. The only recurring pro-
blem has been a cable that sometimes does
not make connection (as in TS-1000 to 16K
ram pack problems).

Meanwhile, I am now saving all my Tas-
word files on disk, and boot Tasword up
from it. So far, I have not lost a_ single
file nor has any failed to load. It is

truly a hassle-free system in this way. I

have not yet tried some of the more ad-
vanced features of the operating system
Since I am not much of a programmer, more

of a user of what others do.

Complaints? A few. The power supply can
get very hot and definitely must be kept
in a well ventilated area. The interface
which plugs into the back of my computer
and the cable that plugs into the
interface add 6" to the depth my computer
occupies on my desk. I would much prefer a
Tasman or Aerco type interface box and
cable connection. And speaking of inter-
faces, there is no way to hook my Aerco
or Tasinman interface up without using a
rear edge connector extension and a Currah

"Micro-Slot" which provides two edge con-
nectors mounted in parallel. Not that
these are insurmountable since this issue

of SUM is being saved and loaded off the
disk drive and printed using a Tasman in-
terface driving our parallel daisy wheel
printer.

13

Here are some more pluses. I have had
the chance to test an Amdek 3" disk drive
often advertised in computer magazines for
the Tandy color computer. It works just
like the Hitachi unit which comés with the
Portuguese drive system. I am confident
that 3 1/2" Sony, 5 1/4" Shugart SA-400
compatible, and even 8" drives can be
operated on this system. They are all
equipped with the same connector and use
the same formatting scheme. Thus a_ second
drive could be added in a more common size
with diskettes available everywhere. One
could even replace the single drive with a
more common size once you found a way to
transfer a copy of the operating system to
the new diskette.

I understand that the English Micro
Connection is accepting orders on the sys-
tems. Contact them for more information.
SUM Magazine would welcome reviews of the
systems being offered by Ramex and Aerco.
Anyone owning one of these systems who is
willing to provide any kind of review at
all may contact SUM. If nothing else, we
will call you and interview you over the
phone and then write up the essence of the
interview. Call us at 904-378-9000 or 462-
1086 evenings.

-- Richard Cravy

FISH LOCATER

THE PROGRAM THAT TELLS YOU WHEN,
WHERE AND HOW TO CATCH MORE FISH!

LET YOUR COMPUTER REVEAL THE SECRETS OF
THE PROS! —_—}

Best Days to go fishing
Best Locations on the water
Best Times
Best Depths
Best Baits
Best Techniques
Overall Prospects any date

Special sections on:
Bass - Walleye - Northern Pike

TS2066 version (cassette w/ instr) $19.95 +82 s/h

BUDGETSOFT - 230N. Main, Rushville, IN 46173
(317) 932-3966 Visa MC Checks

Monitor Output for the TS-1000 & 1500

I have had numerous requests on how to
add direct video to the TS-1000 & TS-1500
computers so as to drive a composite video
monitor. This has been covered many times
in the past in other newsletters and
magazines, but I feel that for those who
are just now starting to use their
computers and those who missed the other
articles, here is how to do it.

The only way to do it is to
the computer and make some
connections and add extra circuitry.
the two monitors that I have,
quite well from just tapping the video
signal before it goes into the modulator
and connect it directly to the monitor
(don't forget the ground). This method
will work on almost all monitors that have
a switchable input impedance -- labeled
Hi-Z and 75 ohm. If you connect the video
from the computer directly to the input of

inside
extra
On
one works

go

the monitor, you should use the Hi-Z
position.
+5 Volts
ce
Video 202222 CS 2w22a2
: 6 Case
es ovr - pru-ovt
o
transistor Mow to -
A a with
Gevond — WS Le
tuput

For monitors that come only with 75 ohm
input, you will need to build a= small
driver circuit to the 75 ohm input of the
monitor. This driver circuit can be a
simple transistor emitter-follower circuit
using the input impedance of the monitor
as the load. Here again, a few monitors
have a slight DC potential on the input,
SO some sort of isolation must be used. A
0.1 micro-Farad capacitor will work fine.

+5 Volts
Video 22222
= Video out
(—___, +o 752
monitor
noaees With
Capacitor J SC isolation
= © at
Cround =

14

Vtetetuet

RE
Video Modulator
me

+5 Ve Its EX) /Ts loco

The video in the

ZX81/TS-1000
found on one of the wires leading into the

can be

RF modulator. The lead to the left is
video (facing from the front) and plus
five volts is the center wire (+5 volts is
needed for the transistor circuit).

Video +5 Velts

fetitorar

On the TS-1500, the video signal can be
found on pin 11 of U1 inside the modulator

and +5 volts can be found on pin 8. The
video can also be found on the left side
of R30 and +5 volts on the right side of

R30 (facing the front of the computer).

These second two places are easier to get
to. As far as adding a connector, I just
clipped the existing leads at the RF

connector and ran my new circuitry over to

the existing connector which gives a
cleaner look from the outside, but you
will not be able to use a regular TV

again.
-- Joe Williamson

FOR SALE: TS-2068 Computer (new), TS-
2040 Printer (new), used Panasonic cassette
recorder. $150 total plus shipping. James
Dunavant, 904/376-5876 evenings, weekends.

ONLY $154.95 .

How much would you expect to pay
for a dual 128K fast access storage
system for your Timex 2068 that
included Centronics and RS232
interfaces, Spectrum software and
buss emulation, and free word
processing software as standard?

THE INCREDIBLE DAMCO/ROTRONICS

WAFADRIVE

*“Wafadrive for the Sinclair Spectrum $154.95.
The Timex 2068 requires the Rainbow Spectrum
interface and the Omni-Emu emulator cartridge.
The Omni/Emu cartridge is required to operate the Watadrive

system. The Wafadrive will not operate by just changing the
ROM to the Spectrum ROM or by using the ROM switch.

A fast reliable dual-

integrated System

The Wafadrive is a
complete system which

contains the micro interface,

two 128K drives, RS232 and
Centronics ports, all in one
attractively-styled, compact
unit. There is a minimum of
connecting leads and no extra
boxes to clutter the desk top.
Like the majority of profes-
sional systems, the units are
dual drive. This offers the opti-
mum balance between
system flexibility and cost.
Built-in serial and parallel
interfaces allow the direct
connection of just about any
popular printer.

Fast and Reliable

The Wafadrive achieves
very fast loading and saving,
but not at the expense of
reliability. Extensive research
and the use of high grade
materials ensure that the
Wafadrive will give years of
dependable operation. Data
integrity is on a par with
floppy disk. The fully inter-

changeable wafers are avail-
able in three sizes-128K, 64K
and 16K. Low capacity
wafers give faster access.
They are therefore most
Suitable for program develop-
ment applications. The high
Capacity wafers are suitable
for more general data storage.
Loading rate is approximately
2K per second-almost twice
as fast as similar products.

The Omni-Emu cartridge
enables the Timex 2068 to run
thousands of Spectrum pro-
grams. Only ass 95.

Software
_ Armed with the com-

| DRCEROTRNG TR WAFADRIVE PRICE LIST __

__ DAMCO/ROTRONICS WAFADRIVE *154.95____

(Spectrum version)

__ Omni-Emu Cartridge $39.95
__ RAINBOW Spectrum interface $34.95
__ 16K Wafer $2.99
__ 64K Wafer 83.49
__ 128K Wafer $3.99.
__ RS232 Cable $12.95

$12.95

Total:

$2.00 per order all other items.
(No postage required for
cables, wafers, or interfaces if
ordered with drive.)

MA residents add 5% sales tax.

:
:
| __ Centronics (Parallel) Cable
|
|

prehensive user manual,
blank wafer and word pro-
cessor supplied, you can use
your Wafadrive right away.
There is also a rapidly
growing range of software to
enable the programmer and
games player to exploit the
Wafadrive system to the full.

Spectrum Emulation

Postage *5.00 for Wafadrives_

drive storage system

The Rainbow Spectrum
Interface changes the rear
buss of the Timex 2068 to that
of the Spectrum. This enables
Spectrum hardware (like the
Wafadrive) to run on the
Timex 2068. Housed in a
compact plastic case designed
to complement the 2068. Only

$34.95.

_New Products Catalog

Our new catalog, featuring
exciting Timex/Spectrum
hadware and Wafadrive
software is now available free!

EM GEG SRT se Re a Sete eee

ORDERING INFORMATION -
Payment can be made in the form of money order, check, VISA, or i
Mastercard. Personal checks take two weeks to clear. VISA and
Mastercard orders must include number, expiration date, and
owner’s signature.

LL} | enclose a check/Money Order
LJ Charge my VISA/MC account no.
[} VISA/MC Expiration date

Signature:

Mail to: DAMCO ENTERPRISES
67 Bradley Ct.,Fall River, MA 02720
(617) 678-2110

Due to the fluctuation in the international currency, our prices are
subject to change without notice.

|
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|
|
|
|
J

Announcing!!
“Enelish Micro Connection

Games Club’’

® 15% discount on all 4
Spectrum games software!

: n all
o discount OF
: rer to a 19! ection.
This card ont em English Micro conn
are

games Ss
DATE

EXPIRAT

© Best-selling English
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ee ee WwW or, ene
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° Cc ae ges Ce
av ailable - <a

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e Annual membership of only $9.95

e Official membership card and personal ID number

Take 15% off these already low prices!

Gremlins, The Adventure ...... $13.95 Backpacker’s Guide, I .......... $12.95
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eae oe ec eee re $13.95 DK’ Tronics Minder ............ $13.95
Beyond’s Shadowfire........... $13.95 SS ee rr $12.95
Raid Over Moscow...........-- $12.95 3-D Star Sterike:. 2... fie ees $9.95
ites OAR... ec ko kes Sees $12.95 Bete Ce) og ce cece cds $6.95
sh SSeS eee ee Se $9.95 Agena 3000 5. eo 08 455 55 $6.95
Brian Bloodaxe ...............- $12.95 Knight lore..........55.-cses $12.95
Daley Thompson’s Decathalon.. $10.95 BS a a 08s iss ---% $12.95
Sherlock Holmes............... $18.95 American Football ............ . $13.95
WE hs a e e e $9.95 Underwurlde .............4... $12.95

Ask for our catalog for a complete listing!

EMC PORTUGUESE DISK DRIVE SYSTEM .............-+5- $265.00* ppd.

We are now taking orders for this disk drive system manufactured in Portugal specifically for the
Spectrum, TS-2068, and Portuguese 2068. Specify which computer you will be using the system
with when you order.

*Due to fluctuations in the International Currency Market, our prices are subject to change without notice.

To Join: Send $9.95 with your name and address to ‘EMC Games Club”, 15
Kilburn Court, Newport, RI 02840, or call for more information.

Good News & Bad News

I've got GOOD NEWS and BAD NEWS. After
September 1, SUM'S annual subscription
rate will rise to $15 per year -- that's
the bad news! The good news is that anyone
who wishes to extend their subscription at
the current rate of $12/year may do so up
until that time. More good news: the new
rate will allow us to continue to expand
our coverage of the Timex/Sinclair line.
Almost all the letters we get into our
office indicate that our readers are well
pleased with SUM and it is our intention
to keep it that way. I know that I am
always willing to pay for good, solid in-
formation about those things in which I am
interested. SUM should SAVE you money when
you are ready to add software or hardware.
Our advertisers are trying to hold down
their costs, and our articles are aimed at
helping you make more informed decisions
(reviews) or help you to do it yourself
(hardware and software projects).

WANTED: Anyone interested in participating
in or attending a Midwest States ZX/TS
Computer Fair. Please contact Frank Davis,
513 East Main Street, Peru, IN 46970.

TRADE: In an effort to extend my horizons, |
would be interested in trading TS-1000 soft-
ware with other owners (original copies only).
You send your list and I'll send mine. Walt
Legan, 8014 Nashua Lane, Orlando, FL 32817.
305/657-5770.

ORDER BLANK

O | want to subscribe/extend my subscription to SUM Magazine for one year. Enclosed is:
0 $12.00 before 9/1/85 0 $15.00 after 9/1/85 (U.S. only)

| want to order the following back issues:

O Complete Set: January ’85 - June ’85 — $8.50
O January 85 — $1.50

O February ’85 — $1.50

O March ’85 — $1.50

0 April ’85 — $1.50

O May ’85 — $2.50

O June ’85 — $1.50

Make all checks payable to “SUM Magazine’’. All prices are postage paid.

0 $18.00 (Canada in U.S. funds)

ee eo ee
Address
City/State/Zip

Expiration Date (see label)

I.S.1. SOFTWARE

QUALITY MACHINE CODE SOFTWARE

ESCAPE (TS 2068 Only)

Muiti-frame, nigh adventure dungeon game.
Survive challenge and traps !

WORD PROCESSOR(ZX 81 / TS 1000)

16K RAM required. High speed, programme
Saveable, printer output, 9K text.

HIGH RESOLUTION GRAPHICS
(TS 1000 / ZX 81 Only)

Game creators : OQne minute loading, 192X128
resolution, faster PLOT, test and unplot points.

MACHINE COOE UTILITIES
(ZX 81 / TS 1000 Oniy)

25 Integrated utilities ! Animation, score
keeping, DATA, READ, RESTORE, multi-direction
scrolling.

ALL PROGRAMS HAVE MUCH MORE !1!

TO ORDER, OR FOR FREE CATALOGUE:

INTER-PACIFIC SYSTEMS INC. SOFTWARE DIVISION

3770 Duke Road, R.R.# 1,
VICTORIA, 8.C.. Canada.

Orders payable in U.S. funds, by certified cheque or
international money order to [.S.I.

FOR SALE: TS-2068 with Romswitch, Tas-
man Interface, Tasword II, Profile 2068, plus
more. $400 or best offer. Richard Sica, 79-B
Prospect Ave., Red Bank, NJ 07701. 201/842-
0517.

SUM MAGAZINE — 3224 NW 30 Avenue — Gainesville, Florida 32605 |

Color Monitor Sale!!

Upgrade Your Computer System! Break the TV Habit!

By a stroke of very good luck, SUM has come into possession of
FOUR Composite Color Monitors which were only used as
Dealer Demos. These monitors are fully. compatible with the
Timex 2068 Computer, using the same cable presently used to feed
your IV or monitor. ‘

Our selection includes one Texas Instruments 12’’, one Amdek
Color I 13’’, and two NEC JB1215 Color 13’’. We have used
every one and they are in perfect colorful working order. Being
demos they lack their original boxes and manuals. Current retail on
these monitors is over $300 each, with even mailorder discounters
asking $220 or more.

These monitors give color resolution and quality exceeding most

$f 799° TVs and there is never any RF interference. Games and other

software comes to life! However, resolution is not sufficient for 64
column mode. As they are sure to go fast, call for availability.

— ee
includes shipping Our prices include shipping in the continental U.S.A.

SUM Magazine e 3224 NW 30th Avenue ¢ Gainesville, FL 32605 ¢ 904/462-1086 eve.

settee
ay Kor

BULK RATE
U.S. POSTAGE
TS 2068 PAID
PERMIT NO. 460

3224 Northwest 30th Avenue
Gainesville, Florida 32605

Gainesville, FL